The deny list in link_ipv4ll_enabled() are mostly non-ethernet type, whose link->iftype are not ARPHRD_ETHER, e.g. ARPHRD_NONE for bareudp, ARPHRD_WIREGURAD for wireguard, ARPHRD_GRE for gre, and so on. Only the exception is vrf, which is ARPHRD_ETHER, but seems not to support ARP.
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